Viessmann Vitoflame 200 Service Instructions Manual page 15

Oil burner control unit
Cause
After mains power failure
After falling below undervoltage level
In case of premature, faulty flame
signal during pre−purge time t1
In case of premature, faulty flame
signal during oil preheat time t0
If burner does not light within safety
time t2
If flame fails during operation
No heating or oil preheater enabling
within 10 min
Fault shutdown
After a fault shutdown, the oil burner
control unit remains locked out
(non−modifiable fault shutdown) and
the red indicator illuminates.
This state is also maintained after
the mains power supply has failed.
Resetting the oil burner control unit
The system can be immediately reset
after a fault shutdown. Hold down
the reset button for approx. 1 s
(< 3 s).
Ignition sequence
If the flame fails within the safety
time, the system re−ignites but no
longer than up to the end of the max.
safety time. This allows several
ignition attempts within the safety
period, see program sequence on
page 25.
Initial start−up, inspection and maintenance
(cont.)
Response
Restart
Restart and fault shutdown
Fault shutdown at end of pre−flush
time t1
Starting will be inhibited after a
maximum of 40 s fault shutdown
Fault shutdown at end of safety
time t2
max. 3 restarts, then fault shutdown
Fault shutdown
Repeat restriction
For flame failure during operation,
up to three re−ignition attempts can
be made. The fourth flame failure
during operation triggers a fault
shutdown. The count of these
repeats begins with every controlled
start−up (through temperature or
pressure regulators, thermostat or
pressure limiters or safety limiters).
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